Injector



April 23, 1929. R. G. BRooKE l 1,710,608

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Patented Apr. 23, 1929.

UNITED STATES PATENT OFFICE.

ROBERT GRUNDY BROOKE, 0F MANCHESTER, ENGLAND, ASSIGNOR TO HOLDEN AND BROOKE LIMTED, 0F MANCHESTER, ENGLAND.

INJECTOR.

Application led July 22, 1927, Serial No. 207,731, and in Great :Britain` July 24, 192B.

This invention relates to injectors of the kind in which a sliding delivery cone is associated with and employed to control the injector overflow.

The object of the present invention 1s to provide, in a more effective manner than heretofore, for the prevention of movement of the delivery cone, Whatever its function may be.` except when purposely desired, and this I eflect by supply of steam. Thus premature overflow closing movement oi' the delivery cone, due to pressure set up in the delivery chamber by the steam jet previous to or dur ing the formation of the working jet. can be may be variously carried into effect. It may` for example be applied to an injector embodying a combining cone having a sliding part controlling an upper or supplementary overllow and particularly intended to Work with hot feed 'Water where it becomes necessary or drsiralilc to close not only this supjfilementary overflow but also the ordinary overflow, and an injector ot this type has been chosen for illustration in the accomj'ianying drawing, Fig. 'l ot which a longitudinal section of the parts essential to an understanding of the improvements. Fig. 2 is a similarview ot a portion ot such an :injector sluinving a modification.

ln the said drawing l represents the body ot the injector, 2 the water inlet, 3 the overflow branch, 4l the steam nozzle. 5 and (i the statimun'y and movable parts constituting the coinljiining conc and 7 the delivery chamber. When an ordinary injector of this type, that is to say one having a stationary delivery cone, is at Work the supplementary overflow which takes place by Way of the gap 8 and valve seating 8a is closed and held closed by the action of the sliding part 6 of the combining cone itself, the ordinary overflow remaining open, but in the case of a sliding delivery cone injector of this type, as illustrated, the delivery cone 9 closes the ordinary overflow at llland at the Sametime the outlet of the supplementary overflow at 8 with it, so that it closes or controls both overflows. j

The premature movement of the sliding de-` livery cone 9 may be prevented by forming or providing the said delivery cone with an enlarged part or piston 11 separating the delivery chamber 7 from another chamber 1.2 which is in communication through a passage or passages 13, 14, 16 formed partly in the injector body, and,.it maybe, external piping, (not shown) with the saine source of steam as that which Works the injector, whereby the sliding delivery cone 9 is held in position such that the overflow is open and free while the injeetoris starting. The pressure ofthe steam acting upon the enlarged part or piston 11 aforesaid need not be the same as that of the steam which Works the injector so long as it bears an approximately constant ratio thereto and it may, if preferred, be derived, for example, from some part in which there is a Venturi effect such as at the throat 15 of the converging and diverging steam cone 4, or from a region near thethroat in the converging or diverging part of suoli steam cone. lVhen a pre( reached the opposing pressure in the chamber 12 is overcome andthe delivery cone therebymovcd to close the overflows. In the arrangements shown in the drawings the sur face area subject to delivery pressure is larger than the piston area presented to steam in the chamber 12. ln other ivm-ds the area acted upon by the delivery pressure is equal to that of the piston 11 plus that of an annulus corresponding to the cross section of the conc 9 at the point where it begins to Widen out.

Any suitable form of packing or stufling box may be provided for the sliding delivery cone. 19 representing such a box and 20 heilig the gland thereof.

In some 1ases, the slidingIr portion 6 of the combining cone may be made in a number of pieces so as to form an additional overflow or overflows, as for example in exhaust steam injectors; or one or more additional permanently open overflows may be provided.

If desired the sliding cone 9 at the delivery chamber end may, as shown in Fig. 2, be provided with a rod or bar 21 passing to the outside of the injector through a suitably arranged stuffing box 22 and gland 23 so that in case of sticking, the sliding cone 9 can be etermined delivery pressure `is j torcibly actuated by hand either by direct pull and push as through handle 2-1 or by any suitable lever' or other mechanical arangement The details may be variously modified.

By means of the present invention steam acting in the chamber 12 provides an ample margin of power to overcome both the pressure in the delivery chamber 7 and the friction ot the packing around cone 9 while leaving the overflow unrestricted and free to act, and the closing otthc overflow which talies place as soon as the delivery pressure overcomes the steam pressure in chamber' 12, can be delayed as long as required, according to the ratio iixed between the area of the piston exposed to steam in chamber 12 and that of the surface subject to delivery pressure. The nearer these two areas approach one another in the arrangement illustrated the higher will the pressure in the delivery chamber 7 have to become before the pressure in chamber 12 overcome.

lVliat I claim is z- 1. A steam injector olf the kind rel'erred to, comprising a delivery chamber, a slidingl delivery cone extending into said chamber, a chamber in communication with a source ot steam and piston means connected to the sliding cone acted upon by the steam in such steam chamber, ivhereby movement of the cone is prevented, except when purposely desired, by pressure independent of that set up by the jet in the injector.

2. A steam injector of the kind referred to, comprising` a delivery chamber, a sliding delivery cone extending into said chamber, a chamber in coi'nmunication with a source ot steam, piston means connected to the sliding cone acted upon by the steam in such steam chamber, whereby movement of the cone is prevented, except when purposely desired, by pressure independent of that set up by the jet in the injector and means whereby the cone can be 'forcibly actuated by hand.

3. In a steam injector of the hind re'terred to, a sliding delivery cone, a delivery chamber, a chamber through which the cone e);-

tends, which chamber is in commuuication with a source ot steam, and a. piston on the cone separating the delivery chamber trom the steam chamber referred to.

4. In a steam injector of the kind referred to, a sliding delivery cone, a delivery chamber, a. chamber through which the cone extends, Which chamber is in communication with a source et steam, a pistou on the cone separating the delivery chamber from [he steam chamber referred to, a stalling box `forming part ot the delivery chamberfa rod attached to the delivery cone and extending through the stuiling box to the outside ol the injector and means whereby the rod can be pulled and pushed to forcibly move the delivery cone.

5. In combinatirm, an injector bodyv having main and supplementary overflows, a steam cone, an associated couibiniug cone having a sliding ila-rt controlling theisu] plementary overflow, a delivery chambe a slidingl delivery cone extending into the'delivery chamber and adapted to close the main over-Ile f and move the sliding part oi' the coml'aining cone to close the supplementary overflow, a piston chamber through which the delivery cone passes,` a pistou on the said cone separating the delivery chamber from the pistou chamber and steam connections placing the pisw ton chamber in communication with the interior of the steam cone, for the purpose specified. u

Signed at llnlanchest-er, England, this seventh day of July, 1927.

ROBERT GRUNDY B OOKE. 

